From: BUI, TIN T (SBCSI) (tb4565@xxxxxxx)
Date: Fri Jan 05 2001 - 21:08:44 GMT-3
I'm not sure what you just said in your previous message, but if R1 has
statement "neighbor x.x.x.x remote-as y" where x.x.x.x is ip address of R3
router and y is AS that R1 & R 3 belongs to then R1 has just formed an IBGP
peer to R3 and therefore any Routes R1 knows will be advertised to R3
regardless of any route reflectors statements.
> Tin T. Bui
> Senior Network Manager
> Network Management Center
> SBC Services Inc.
> 7337 Trade Street, Rm 1110
> San Diego, Ca 92121
> Office #: 858-886-4644/858-886-4589
> Pager #: 858-494-0482
> Fax #: 858-549-4103
> Email: tb4565@sbc.com
>
-----Original Message-----
From: Randy Feliz [mailto:rjfeliz@yahoo.com]
Sent: Friday, January 05, 2001 3:30 PM
To: BUI, TIN T (SBCSI); 'Connary, Julie Ann'; David C Prall
Cc: CCIE Lab groupstudy.com
Subject: RE: route-reflector question
a route reflector will pass info from a non-client to
a client and from a client to a non-client...and
from a client to another client....it will not pass
info from a non-client to another non-client
--- "BUI, TIN T (SBCSI)" <tb4565@sbc.com> wrote:
> This makes total sense as my understanding is that
> Router Reflectors (R1)
> will advertise to Route-reflector clients and its
> IBGP peers. Eventhough R3
> is not route-reflector client of R1, it will also
> receive route because it
> is an IBGP peer of R1. This is put in place so that
> there is no restriction
> that forces all IBGP routers (that are not route
> reflectors) in same AS to
> be route reflector clients.
>
> > Tin T. Bui
> > Senior Network Manager
> > Network Management Center
> > SBC Services Inc.
> > 7337 Trade Street, Rm 1110
> > San Diego, Ca 92121
> > Office #: 858-886-4644/858-886-4589
> > Pager #: 858-494-0482
> > Fax #: 858-549-4103
> > Email: tb4565@sbc.com
> >
>
>
> -----Original Message-----
> From: Connary, Julie Ann [mailto:jconnary@cisco.com]
> Sent: Friday, January 05, 2001 2:00 PM
> To: David C Prall
> Cc: CCIE Lab groupstudy.com
> Subject: Re: route-reflector question
>
>
> Hi All,
>
> I fully realize that route-reflectors are a
> replacement for fully-meshed
> IBGP. Hence my question why
> R3 should get the route at all since it is not
> internally peered to
> R5 and R1 is not setup to reflect to it - although
> it seems to be doing
> just that.
>
> Sorry - long day - I'm going home now. If anyone has
> any ideas why R1 would
> reflect an internal
> router to another internal peer that is not a
> route-reflector client
> ---------
>
> Julie Ann
>
> At 04:41 PM 1/5/2001 -0500, David C Prall wrote:
> >I believe this is confusion between internal and
> external routes. Internal
> >BGP routers must be fully meshed, they only
> advertise their local networks
> >to other internal neighbors. External BGP routes
> will be advertised to
> other
> >internal neighbors. The use of a route reflector
> allows internal routes to
> >be advertised to other internal routers, thus
> relieving the need for a
> fully
> >meshed topology.
> >
> >David C Prall dcp@dcptech.com
> http://dcp.dcptech.com
> >----- Original Message -----
> >From: "Connary, Julie Ann" <jconnary@cisco.com>
> >To: <ccielab@groupstudy.com>
> >Sent: Friday, January 05, 2001 4:23 PM
> >Subject: route-reflector question
> >
> >
> > > Hi All,
> > >
> > > I have a frame-relay hub and spoke network with
> the hub as the
> > > route-reflector server and the spokes as
> clients.
> > >
> > >
> > > R3---------------EBGP ---------R4
> > > | 137.20.34.3 137.20.34.4
> > > | 137.20.1.3
> > > |
> > > IBGP
> > > |
> > > |
> > > | 137.20.1.1 137.20.1.5 137.20..129.5
> 137.20.129.7
> > > R1-----------------ibgp
> ---------R5----------EBGP ------------R7
> > >
> > >
> > > R1 is the frame-relay hub with R3 and R5 as
> spokes.
> > > R7 is initiating a route - 160.0.0.0/4. R4 is
> also intiating a route -
> > > 172.168.2.0
> > > I had setup R1 to route-reflect to R5, but not
> to R3. So I had expected
> > > that R5 would see the
> > > route from R4, but R3 should not see the route
> from R7 - as R1 should
> not
> > > reflect it - correct?
> > >
> > > On R3 I see the following:
> > >
> > > r3#show ip bgp
> > > BGP table version is 33, local router ID is
> 137.20.31.65
> > > Status codes: s suppressed, d damped, h history,
> * valid, > best, i -
> >internal
> > > Origin codes: i - IGP, e - EGP, ? - incomplete
> > >
> > > Network Next Hop Metric
> LocPrf Weight Path
> > > *>i160.0.0.0/4 137.20.129.7
> 100 0 3 i
> > > *> 172.168.2.0/24 137.20.34.4 0
> 0 1 ?
> > >
> > > r3#show ip bgp 160.0.0.0
> > > BGP routing table entry for 160.0.0.0/4, version
> 33
> > > Paths: (1 available, best #1)
> > > 3, (aggregated by 3 170.10.10.1)
> > > 137.20.129.7 (metric 84) from 137.20.1.1
> (137.20.129.5)
> > > Origin IGP, localpref 100, valid,
> internal, atomic-aggregate,
> best
> > > Originator : 137.20.129.5, Cluster list:
> 137.20.11.33
> > >
> > > With a BGP setup of:
> > >
> > > !
> > > router bgp 2
> > > neighbor 137.20.1.1 remote-as 2
> > > neighbor 137.20.34.4 remote-as 1
> > >
> > >
> > > On R1 I see:
> > >
> > > r1#show ip bgp
> > > BGP table version is 25, local router ID is
> 137.20.11.33
> > > Status codes: s suppressed, d damped, h history,
> * valid, > best, i -
> >internal
> > > Origin codes: i - IGP, e - EGP, ? - incomplete
> > >
> > > Network Next Hop Metric
> LocPrf Weight Path
> > > *>i160.0.0.0/4 137.20.129.7
> 100 0 3 i
> > > *>i172.168.2.0/24 137.20.34.4 0
> 100 0 1 ?
> > >
> > > r1#show ip bgp 160.0.0.0
> > > BGP routing table entry for 160.0.0.0/4, version
> 25
> > > Paths: (1 available, best #1, advertised over
> IBGP)
> > > 3, (aggregated by 3 170.10.10.1), (Received
> from a RR-client)
> > > 137.20.129.7 (metric 84) from 137.20.1.5
> (137.20.129.5)
> > > Origin IGP, localpref 100, valid,
> internal, atomic-aggregate,
> best
> > >
> > > with a bgp setup of:
> > >
> > > router bgp 2
> > > no synchronization
> > > neighbor 137.20.1.3 remote-as 2
> > > neighbor 137.20.1.5 remote-as 2
> > > neighbor 137.20.1.5 route-reflector-client
> > > neighbor 137.20.12.2 remote-as 2
> > > neighbor 137.20.12.2 route-reflector-client
> > >
> > > (note that 137.20.1.3 is not a
> route-reflector-client.)
> > >
> > > On R5 I have:
> > >
> > > r5#show ip bgp
> > > BGP table version is 3, local router ID is
> 137.20.129.5
> > > Status codes: s suppressed, d damped, h history,
> * valid, > best, i -
> >internal
> > > Origin codes: i - IGP, e - EGP, ? - incomplete
>
=== message truncated ===
=====
Thanks
Randy Feliz
CCIE# 4331
rjfeliz@yahoo.com
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